Question 42 The following is a list of some of the structures of the respiratory tract: 1. Secondary bronchi 2. Bronchioles 3. Alveolar ducts 4. Primary bronchi 5. Respiratory bronchioles 6. Alveolar sacs 7. Terminal bronchioles The order in which air passes through these structures is: O 4, 1, 2, 7, 5, 3, 6 O 4, 1, 2, 5, 7, 3, 6 O 1, 4, 2, 7, 5, 3, 6 O 2, 4, 1, 7, 5, 3, 6 O 1,4, 2, 5, 7, 3, 6

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